Discussion
Assertion (A): A sonic boom is heard only at the moment an aircraft passes through Mach one.
Reason (R): An aircraft in steady supersonic flight trails a shock system continuously.
Select the correct answer from the options below.
Answer: D
The assertion is false and the reason is true, and the reason is what refutes it. The shock system persists for the whole of the supersonic flight, sweeping across the ground as a continuous carpet. Every observer along the track hears a boom as it passes, not just those beneath the point of acceleration.
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